Do we believe in miracle as its can happening and changing our life instantly?
How long it has been, and how many times we've seen miracle?
If you've seen none, and perfectly fine with that, then you are just fine - you need no any particular belief at all. Perhaps miracle just one of the most common think in your daily life.
But if you wish to see one, perhaps we should start questioning, what we have lost or still lack in this life? Are we feel incomplete? Why? To dare to see the question nakedly is the key to find what you may call as your own miracle.
But if you believing in miracle in one side, and stop moving forward waiting for the miracle to happen in other side. Then perhaps those belief is nothing but a waste for you. Well, just note that I said it as "perhaps".